Strainer



Jan. 1o, 1939.l M. w. HUBER 2,143,270

STRAINER d Filed Aug. 13, 1956 2iSheets-Sheet- 1 Jan. 1'0, 1939.,

M. W. HUBER STRAI NER Filed Aug. l5, 1956 2 Sheets-Sheet 2 invul.

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Patented Jan. 10, 1939 UNITED STATES STRAINER Matthew W. Huber, Chicago,Ill., assgnor to Tuthill Pump Company, Chicago, Ill., a corporation ofIllinois Application August 13, 1936, Serial No. 95,796

7 Claims.

The invention relates to strainers and more particularly to that type ofstrainer which comprises a series of superposed` screen-frames.

'I'he objects of the invention are to provide a strainer which iscompact in construction with a maximum capacity for the space used;which is composed of a series of screen-frames and may be decreased orincreased at will to vary its capacity; which is composed of a series ofscreenframes having grooves in their abutting faces forming inlet andoutlet ducts which can be readily cleaned which is composed of frameswith screens which are assembled without soldering; which is built up tothe desired capacity with mating pairs of frames, with provision forpreventing the incorrect assembling of the frames; and which can beproduced at a low cost. Other objects or the invention will apear fromthe detail description.

The invention consists in the several novel features which arehereinafter set 'forth and are more particularly defined by claims atthe conclusion hereof.

In the drawings: Fig. i is a vertical section showing a strainerembodying the invention applied to a pump-casing, the section beingtaken through the inlet ports of the screen sections. Fig. 2 is a planview showing the strainer removed from the pump-casing. Fig. 3 is asection on the line 3 3 of Fig. 2. Fig. 4 is a horizontal section on thelinedll of Fig. 1. Fig. 5 is an enlarged fragmentary sectional viewthrough several of the screen-frames. Fig. 6 is a perspective of anassembled group of screen-frames and 35 the bottom plate. Figs. 'Z and 8are perspectives of a mating pair of screen-frames. Figs. 9 and 10 aredetails illustrating the manner of uniting the screen-cloth to thescreen-frames.

The strainer which is shown in the drawings 40 constitutes the preferredembodiment of the invention. it comprises a casing It and is illustratedin connection with a fuel oil pump which includes a housing l2. Thelatter has a at bottom face against which the strainer casing ts, andembodies a vertical duct I3 through which oil enters the casing M. Italso embodies a vertical duct 35 whereby the strained oil is deliveredback to the pump. The casing It has an open top and comprisesside-walls, a bottom wall, and a housing engaging ange around the upperportions of the side walls. It also comprises an upstanding centralcylindrical sleeve i5. A screw-bolt I6 extends through the sleeve I5 andis threaded into the pumphousing VI4 to secure removably thestrainercasing against the pump-housing.

In addition to the casing I4 the strainer comprises a series ofcomplementary pairs of mating screen-sections I l and I8, superimposedupon and abutting adjacent one another. Any desired number of thesesections may be assembled in the casing` I@ to give the strainer therequisite capacityforits particular use. Each of these screensections isbuilt up oi a substantially rectangular cast-frame i9 and a screen 20usually of woven wire, which extends across the frame midway between theupper and lower faces of the frame. Each frame has an integral centralring 2i supported by integral ribs 22 which extend inwardly from thesides of the frame. The rings 2i t around the sleeve. I5 in thestrainer-casing. At one side of each ring ,20 there is provided avertical cylindrical port 23 to form a continuous vertical inlet duct24, which registers with the duct i3 in the pump-housing. The upper andlower faces of frames I7 and I8 have 'nished faces so the frames willfit tightly on top oi one another. The lower-most frame of the assembledseries is closed by a bottom plate 25, the margin of which conforms tothe screen-frames. This bottom plate 25 has an opening tol iit aroundthe sleeve I5 and an opening 26 registering with the vertical intakeduct 24 topermit the oil to be strained to pass through thescreen-frames from duct i3 to the bottom portion of the strainercasingId. A spring 2l around the sleeve I5 is interposed between the bottom ofthe casing I4 and the underside of the bottom-plate 25 and serves topress said plate upwardly with sufficient force to `iorce the abuttingfaces of all of the screen-frames into tight contact to prevent liquidfrom ilowing between said faces, except where grooves are provided forthat purpose. In fabricating the screen-sections, the several parts ofeach screen-frame are formed with an angular recess 29, as shown in Fig.9, and withan excess of upstanding metal Silwhich is swaged or presseddownwardlyand inwardly to lap the portion of the screen-cloth whichrests on the bottom of said recess and to provide a substantially planecr flat face on the top of the frame. This exemplifies an inexpensiveand efcient method of building up the `screen-sections of frames andscreen-cloth without requiring any soldering or braising, and so thescreen-sectionsjwill not be damaged or buckled While they are beingcleaned.

Each screen-frame `is provided in one of its sideswith a vertical port34 which forms, when the` screen-sections are assembled, a continuousvertical outlet duct through the screen-sections and leads to the duct35 in the pump-housing.

In assembling the strainer while it is removed from the pump-casing, thebottom-plate and screen-frames are slid downwards on the sleeve I5, thebottom-plate 25 being positioned beneath the lowermost screen-section.When the strainer-casing is drawn upwardly by bolt I6 toward thepump-casing, the spring 21 will be compressed and subject thescreen-sections and plate 25 to sufficient pressure to form tight jointsbetween their abutting faces. When the casing is removed from thepump-housing the screensections may be readily slipped oi the sleeve I5and separated so that both faces and the grooves therein may be easilycleaned.

The abutting faces between alternate screenframes I'I, I8 are formedwith mating semicircular grooves 32, 33, to form ducts for deliveringliquid or oil from the chamber in the strainer-casing I4 into the spacesbetween the screens. The abutting faces of the frames which alternatewith the faces provided with grooves 32 and. 33, are provided withsemicylindrical mating ducts 3l, 31 to deliver the oil or liquid intothe outlet duct 3d after the oil has passed through one or more of thescreens. This alternate formation of the grooves makes it necessary forthe oil to pass through the screens before reaching the outlet. Eachscreen-frame is provided with a vertical notch 38 in one of itsend-faces to register with a vertical rib 39 integrally formed with thestrainer-casing. When the screen-sections are assembled correctly,notches 38 are vertically aligned to register with, and receive, the rib39. These notches, in assembling the strainer, must be positioned inregistry with the rib 39 in order to permit the assembly of thesections, so that the screen-frames can be placed in the casing only intheir correct horizontal position in the casing, and so that ports 3cand ports 23 will be aligned to form continuous ducts in alignment withthe ducts 35 and I3 respectively. A dowel-pin 40 projects upwardly fromthe top-face of the strainer-casing and is adapted to enter acorresponding hole in the pump-housing I2 correctly to position thestrainer-housing and strainer-sections below the pump-housing, so thatthe vertical inlet and outlet ports passing through the strainersections will be in registry with the ducts I3 and 35 in thepump-housing. Each screen-frame is also provided at one end with aprojecting and depending lug 42. The lugs 42 on the alternating sectionsI'l and I8 are offset on opposite sides of the longitudinal center ofthe frame, so that if attempt is made to assemble one of the sections inan inverted position the lug 42 on the contiguous frame would interferewith the coming together of the contiguous frames and thus preventimproper assembling of the sections.

The invention exemplies a strainer comprising a series ofscreen-sections with grooves in the abutting faces of the screen-framesforming ducts leading to and from the screen-cloths through which theliquid must pass. The arrangement and design of the screen sectionsmakes is possible thoroughly and easily to clean the ducts when theframes are removed from the casing. The capacity of the strainer may bedecreased or increased at will by increasing or varying the number ofcomplementary pairs of screen-sections. The strainer as a whole iscompact with maximum capacity for the amount of space required. Thenecessity of soldering the screen-cloth in the frames is eliminated andboth sides of the screen are readily accessible for cleaning.

Whereas the strainer has been described in connection with a fuel pumpit is to be understood that it may be used in other capacities and withliquid other than oil. It is also to be understood that the invention isnot to be restricted to the details set forth, since these may be modiedwithin the scope of the appended claims, without departing from thespirit and scope of the invention.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent is:

1. A strainer comprising in combination, a series of abuttingscreen-sections comprising each a comparatively thick open type frameand a screen extending across and positioned substantially midwaybetween the side faces of the frame, and having the spaces on oppositesides of each screen coacting with the spaces on opposite sides of theadjoining screens to form a series of full width chambers between thescreens, said screen-sections also having mating pairs of grooves inevery other pair of abutting side faces of the frames forming liquidconducting ducts leading to every other chamber, and mating grooves inthe alternate pairs of abutting side faces of the frames forming liquiddischarging ducts communicating with the alternate chambers, and meansfor clamping the screen sections together.

2. A strainer comprising in combination, a series of abuttingscreen-sections comprising each a comparatively thick open type frameand a screen extending across and positioned substantially midwaybetween the side faces of the frame and having the spaces on theopposite sides of each screen coacting with the spaces on opposite sidesof the adjoining screens to form a series of full width chambers betweenthe screens, said screen sections also having aligned holes in theframes thereof forming an outlet duct and in addition mating pairs ofgrooves in every other pair of abutting side faces of the frames formingducts for introducing liquid into every other chamber for passagethrough the screens into the alternate chambers and pairs of matinggrooves in the alternate pairs of abutting side faces of the framesforming discharge ducts for the strained liquid leading from thealternate chambers to the hole formed outlet duct, and means forclamping the screen-sections together.

3. A strainer comprising in combination, a series of abuttingscreen-sections comprising each a comparatively thick open type frameand a screen extending across and positioned substantially midwaybetween the side faces of the frame, and having the spaces on oppositesides of each screen coacting with the spaces on opposite sides of theadjoining screens to form a series of full width chambers between thescreens, said screen-sections also having mating pairs of grooves inevery other pair of abutting side faces of the frames forming ducts forintroducing liquid into every other chamber for passage through thescreens into the alternate chambers, and pairs of mating grooves in thealternate pairs of abutting side faces of the frames forming ducts forpermitting discharge of the strained liquid from said alternatechambers, means for clamping the screen-sections together, aligned lugsconnected to and disposed outwardly of the outer portions of alternateframes and projecting laterally with respect to the screen sections intolapped relation with the outer faces of the other frames, and similarlydesigned aligned lugs on the outer portions of said other framesarranged in offset relation with the first mentioned lugs and coactingwith the latter to prevent assemblage of the screen sections with anyone thereof in reversed relation with respect to the others.

4. A strainer comprising in combination, a casing, a series of abuttingscreen-sections in the casing each comprising a comparatively thick opentype frame and a screen extending across and positioned substantiallymidway between the side faces of the frame, and having the spaces onopposite sides of each screen coacting with the spaces on opposite sidesof the adjoining screens to form a series of full Width chambers betweenthe screens, said screens also having mating pairs of grooves in everyother pair of abutting side faces of the frames forming ducts forintroducing liquid into every other chamber 1 or passage through thescreens into the alternate chamber and pairs of mating grooves in thealternate pairs of abutting side faces of the frames forming dischargeducts for permitting discharge ci the strained liquid from saidalternate chambers, means for clamping the sections together, and meansincluding interi-itting means between the casing and the sides of theframes for holding the screen-sections against relative sidewisedisplacement in the casing.

5. A strainer comprising in combination, a casing, a series of abuttingscreen-sections in the casing each comprising a comparatively thick opentype frame and a screen extending across and positioned substantiallymidway between the side faces of the frame, and having the spaces onopposite sides of each screen coacting with the spaces on opposite sidesof the adjoining screens to form a series of full width chambers betweenthe screens, said screens aiso having mating pairs of grooves in everyother pair of abutting side faces of the frames forming ducts forintroducing liquid into every other chamber for passage through thescreens into the alternate chamber and pairs of mating grooves in thealternate pairs of abutting side faces of the frames forming dischargeducts for permitting discharge of the strained liquid from saidalternate chambers, means for clamping the sections together, alignedlugs formed integrally with and disposed outwardly of the outer portionof alternate frames and projecting laterally with respect to the screensections into lapped relation with the outer faces of the other frames,aligned outwardly and laterally projecting lugs on the other framesarranged in offset relation with the rst mentioned lugs and coactingwith the latter to prevent assemblage of the screen sections with anyone thereof in reversed relation with respect to the other, and meansincluding interi'ltting means between the casing and the sides of theframes for holding the screen-sections against relative sidewisedisplacement in the casing.

6. A strainer comprising in combination, a casing provided with acentral post extending therethrough, a series of abutting screensections in the casing comprising each a comparatively thick open typeframe with a rib supported central portion and a screen extendingbetween the frame sides and said portion and positioned substantiallymidway between the side faces of the frame, and having the spaces onopposite sides of each screen coacting with the spaces on opposite sidesof the adjoining screens to form a series of full width chambers betweenthe screens, said screen sections also having aligned holes in thecentral rib supported portions of the frames for the post and alignedholes at one side of the post receiving holes forming a duct forintroducing liquid under pressure into the casing, and having inaddition mating pairs of grooves in every other pair of abutting sidefaces of the frames forming ducts for conducting liquid from the casinginto every other chamber for passage through the screens into thealternate chambers, means forming ducts for permitting discharge of thestrained liquid from said alternate chambers, and means for clamping thesections together.

7. A strainer comprising in combination, a casing provided with acentral post extending therethrough, a series of abutting screensections in the casing comprising each a comparatively thick open typeframe with a rib supported central portion and a screen extendingbetween the frame sides and said portion' and positioned substantiallymidway between the side faces of the frame, and having the spaces onopposite sides of each screen coacting with the spaces on opposite sidesof the adjoining screens to form a series of full width chambers betweenthe screens, said screen sections also having aligned holes in thecentral rib supported portions of the frames for the post and alignedholes at one side of the post receiving holes forming a duct forintroducing liquid under pressure into the casing, and having inaddition mating pairs of grooves in every other pair of abutting sidefaces of the frames forming ducts for conducting liquid from the casinginto every other chamber for passage through the screens into thealternate chambers, means forming ducts for permitting discharge of thestrained liquid from said alternate chambers, means for clampingthesections together, and interfltting means between the casing and theside portions of the frames for preventing the screen-sections frombeing rotatably displaced.

MATTHEW W. HUBER.

